was added to the National Register of Historic Places in 2001. The area includes 480 buildings, of which 325 retain their historic significance. Two parks are also included in the listing. Northside Tulsa's north side originally referred to the area north of the Frisco Railroad tracks up to the northern city limits. It was annexed by the city of Tulsa in 1904. The north side is home to a large percentage of Tulsa's African-American community in addition to working-class Tulsans of other races and ethnicities. The area's Booker T. Washington High School, Tulsa's African-American high school during the segregation era and now a magnet school, was recently judged to be the 58th best high school in the nation by Newsweek. Northeast of downtown, close to Tulsa International Airport, is Mohawk Park, which includes the Tulsa Zoo and the Oxley Nature Center, and the Tulsa Air and Space Museum. This area is also home to the American Airlines maintenance facility, one of Tulsa's largest employers. "Black Wall Street:" The Greenwood Historical District The Greenwood Historical District is just north of downtown and east of the Brady District. It was once one of the most affluent African-American communities in the United States and referred to as Black Wall Street. In 1921, thirty-five blocks of businesses and residences were burned in this district during the infamous Tulsa Race Massacre, the bloodiest incident of racial violence in the history of the United States. The Oklahoma Legislature passed laws in 2001 aimed at revitalizing Greenwood, setting up a scholarship fund for college-bound descendants of the victims and appropriating $2 million for a memorial. As of 2004, two blocks of the old neighborhood have been restored and are part of the Greenwood Historical District. It is now home to the Greenwood Cultural Center, the Tulsa Race Massacre Memorial, and the John Hope Franklin Center for Reconciliation, as well as Oklahoma State University - Tulsa and Langston University. Also in the district as of 2021 is the Greenwood Rising History Center. The Arts District The Arts District is located north across the Santa Fe Railroad tracks from the central business district and centered at Main Street & Brady Avenue. The Brady District is one of Tulsa's oldest areas, characterized by two-story brick warehouses. The Tulsa Theater, built between 1912 and 1914, was originally designed to serve as the city's municipal auditorium and was simply called "Convention Hall"